Article
Energy & Fuels
William Correa Radunz, Yoshiaki Sakagami, Reinaldo Haas, Adriane Prisco Petry, Julio Cesar Passos, Mayara Miqueletti, Eduardo Dias
Summary: Based on observations from modern field experiments in complex terrain sites, wind energy models have been improved to incorporate diurnal cycle unsteadiness and atmospheric stability impact. A recent investigation on two similar wind farms found that the back rows of turbines perform better during stable conditions and nighttime. Designing wind power plants of the future should consider accurately incorporating flow phenomena related to atmospheric stability and the diurnal cycle.
Article
Green & Sustainable Science & Technology
Qiang Wang, Kun Luo, Xuanxuan Ming, Yanfei Mu, Shitong Ye, Jianren Fan
Summary: The interaction between wind farms and the atmosphere has significant climatic impacts, particularly related to atmospheric stability. These impacts are expected to increase in the future, highlighting the importance of considering the potential implications for sustainable wind development.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Yuefeng Zhao, Xiaojie Zhang, Yurong Zhang, Jinxin Ding, Kun Wang, Yuhou Gao, Runsong Su, Jing Fang
Summary: Real-time measurement of atmospheric wind field parameters using an eight-beam wind Light Detection and Ranging (Lidar) system has been demonstrated, showing accurate retrieval of wind speed information and calculation of wind profiles. Experimental results indicate consistent wind profiles produced using different techniques with good accuracy.
Article
Thermodynamics
Dae-Young Kim, Yeon-Hee Kim, Bum-Suk Kim
Summary: This study analyzed the effects of atmospheric stability, turbulence intensity, and wind shear exponent on the power performance and annual energy production of wind turbines. The results showed that atmospheric stability had the greatest impact on AEP, with the highest AEP occurring in moderately unstable atmospheric conditions.
Article
Energy & Fuels
C. A. Lopez-Villalobos, O. Martinez-Alvarado, O. Rodriguez-Hernandez, R. Romero-Centeno
Summary: The characterization of wind speed and its variability is crucial for assessing wind resources. This study implemented the Monin-Obukhov similarity method and the power-law method to estimate wind speed profiles, finding that the log-law and variable wind shear methods provide more accurate estimates. The results also indicated that the vertical variation of wind speed does not affect the average power production of a wind turbine with a 90 m diameter and 80 m hub height.
Article
Acoustics
Marvin Rust, Christian Koch
Summary: Reliable assessment of airborne infrasound emitted by natural and technical sources is important, but limited technology and insufficient regulations exist in the infrasound frequency range. This study compares measurement microphones and microbarometers for infrasound measurements near wind power plants. The results show that wind-induced noise is a major concern in field measurements of infrasound. Field measurements and laboratory experiments are used to determine the influence of wind-induced noise in real-life situations and discuss strategies for establishing quality criteria and controlling the influence of wind on such measurements.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Review
Green & Sustainable Science & Technology
C. Perez Albornoz, M. A. Escalante Soberanis, V Ramirez Rivera, M. Rivero
Summary: Wind energy has experienced significant growth, thanks to the development of wind turbines and tall wind masts. Atmospheric stability plays a crucial role in the wind energy industry, impacting wind profile, energy production, and wake effects.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Paola Crippa, Mariana Alifa, Diogo Bolster, Marc G. Genton, Stefano Castruccio
Summary: This study develops a new model for alpha that captures hourly variability across different geographic/topographic features, outperforming prior formulations and reducing wind speed RMSE by 23-33% on average. The improved estimates have significant implications for wind energy potential assessments and wind farm siting.
Article
Energy & Fuels
Chunlei Wu, Kun Luo, Qiang Wang, Jianren Fan
Summary: The refined wind farm parameterization has limited impact on the flow field, but the average power generation becomes more scattered and is notably decreased by nearly 7% due to the reduced variable air density. Meanwhile, the REWS slightly increases the power estimation by around 1.1%. Both REWS and variable air density can decrease the estimation uncertainty of the average power induced by complex atmospheric stability.
Article
Mechanics
M. Saleem, A. Karnam, O. Rodriguez, J. Liu, E. Gutmark
Summary: The role of micro-vortex generators (MVGs) in reducing supersonic jet noise is investigated in this study. Experimental and numerical simulation results show that MVGs can interact with the shock cell structure of the jet plume and modify its core velocities, leading to a significant reduction in jet noise. These findings have important implications for the design and development of noise reduction technologies for supersonic jet engines.
Article
Meteorology & Atmospheric Sciences
Rogier Floors, Ib Troen, Alfredo Pena
Summary: Modifying the model in the Wind Atlas Analysis and Application program (WAsP), we account for local atmospheric stability parameters, which significantly improves the vertical extrapolations of Weibull wind speed distribution parameters. The model is validated at six locations in northwestern Europe, showing improved estimations of power density distributions by reducing the percentage error from 5.2% to 3% when using the modified model and temperature scale derived from either observations or mesoscale/reanalysis output.
BOUNDARY-LAYER METEOROLOGY
(2023)
Article
Engineering, Mechanical
Ming Xu, Bin Wang, Xiaoya Li, Shengxi Zhou, Daniil Yurchenko
Summary: The study investigates the dynamic characteristics of the galloping energy harvester by separating wind speed into mean and fluctuating components, considering the latter as Gaussian white noise. Decoupling the output voltage using a generalized harmonic transformation and deriving mean output power through stochastic averaging are key approaches employed. Critical wind speed and optimal parameters of the harvester were determined, with the analytical procedure validated through Monte Carlo simulation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Liang Yu, Longjing Yu, Jiaqi Wang, Ran Wang, Zhifei Chen
Summary: Helicopter rotor aerodynamic noise research has become essential as helicopters' reliability and comfort requirements have increased. The lack of a generally accepted formal definition of cyclostationarity based on basic aerodynamic theory and wave propagation model limits the application of cyclostationary methods for analyzing helicopter rotor aerodynamic noise. This paper proposes a formal cyclostationary modeling process based on aerodynamic and wave propagation theory, aiming for subsequent cyclostationary signal processing.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Energy & Fuels
Felipe M. M. Pimenta, Osvaldo R. R. Saavedra, Denisson Q. Q. Oliveira, Arcilan T. T. Assireu, Audalio R. Torres Junior, Ramon M. de Freitas, Francisco L. Albuquerque Neto, Denivaldo C. P. Lopes, Clovis B. M. Oliveira, Shigeaki L. L. de Lima, Joao C. de Oliveira Neto, Rafael B. S. Veras
Summary: The objective was to assess the wind resources of the east coast of Maranhao, Brazil using a combination of wind profilers, micrometeorological towers, and atmospheric reanalysis. Field campaigns recorded wind variations in the dry and wet seasons under the influence of the Intertropical Convergence Zone. The study found distinct diurnal patterns in wind speeds, with strong winds from the northeast during the dry season and decreased speeds with easterly and southeasterly components during the rainy season.
Article
Green & Sustainable Science & Technology
Luoqin Liu, Richard J. A. M. Stevens
Summary: The impact of thermal stratification on wind turbine wakes in complex terrain was studied using large eddy simulations. Results showed that a hill wake significantly reduced power production of a downstream turbine in a convective boundary layer, but surprisingly increased power production in a stable boundary layer. This increase was attributed to enhanced mixing induced by the hill wake, leading to entrainment of kinetic energy from a low-level jet.
Article
Acoustics
Stephen E. Keith, Katya Feder, Sonia A. Voicescu, Victor Soukhovtsev, Allison Denning, Jason Tsang, Norm Broner, Werner Richarz, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
Sonia A. Voicescu, David S. Michaud, Katya Feder, Leonora Marro, John Than, Mireille Guay, Allison Denning, Tara Bower, Frits van den Berg, Norm Broner, Eric Lavigne
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
Stephen E. Keith, Katya Feder, Sonia A. Voicescu, Victor Soukhovtsev, Allison Denning, Jason Tsang, Norm Broner, Tony Leroux, Werner Richarz, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Correction
Acoustics
David S. Michaud, Stephen E. Keith, Katya Feder, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Tara Bower, Allison Denning, Eric Lavigne, Chantal Whelan, Sabine A. Janssen, Tony Leroux, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, Tara Bower, Paul J. Villeneuve, Evan Russell, Gideon Koren, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, D'Arcy McGuire, Tara Bower, Eric Lavigne, Brian J. Murray, Shelly K. Weiss, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Acoustics
David S. Michaud, Stephen E. Keith, Katya Feder, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Tara Bower, Allison Denning, Eric Lavigne, Chantal Whelan, Sabine A. Janssen, Tony Leroux, Frits van den Berg
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2016)
Article
Clinical Neurology
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, Brian J. Murray, Shelly K. Weiss, Paul J. Villeneuve, Frits van den Berg, Tara Bower
Article
Clinical Neurology
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, Brian J. Murray, Shelly K. Weiss, Paul J. Villeneuve, Frits van den Berg, Tara Bower
Correction
Clinical Neurology
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, Brian J. Murray, Shelly K. Weiss, Paul J. Villeneuve, Frits van den Berg, Tara Bower
Correction
Clinical Neurology
David S. Michaud, Katya Feder, Stephen E. Keith, Sonia A. Voicescu, Leonora Marro, John Than, Mireille Guay, Allison Denning, Brian J. Murray, Shelly K. Weiss, Paul J. Villeneuve, Frits van den Berg, Tara Bower
Review
Environmental Sciences
Irene van Kamp, Frits van den Berg
Summary: A study commissioned by the Swiss Federal Office for the Environment focused on the effects of wind turbine sound on local residents' health, with particular attention to low-frequency sound and infrasound. Annoyance was found to be the most significant consequence of wind turbine sound, with the louder the sound, the stronger the annoyance response. Long-term effects were related to the annoyance experienced by individuals, and involvement of residents in the siting process was associated with lower annoyance levels.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Letter
Medicine, General & Internal
Frits (G P) van den Berg
Article
Acoustics
Ellen Veldboom, Chantal van der Werf, Zuhal Incedalci, Frits van den Berg
Summary: For individuals suffering from low-pitched sound irritation, using a low-pitched masking sound on a CD can alleviate the severity of the disturbing sound they hear. Nevertheless, the long-term effectiveness of using masking sounds may diminish.
Review
Acoustics
Irene van Kamp, Frits van den Berge
ACOUSTICS AUSTRALIA
(2018)
Article
Energy & Fuels
Luis A. Martinez-Tossas, Philip Sakievich, Matthew J. Churchfield, Charles Meneveau
Summary: This work revisits the filtered lifting line theory and provides a more general formulation for solving flow problems with significant changes in chord, such as wind turbine blades.